大数加法乘法

int* mul(int* buf, int k){ ll t = 0; for(int i = 0; i < 50; i++){ int s = buf[i]*k+t; buf[i] = s % 10; t = s / 10; } return buf; } void print(int* buf){ for (int i = 60; i >= 0; i--) { if (buf[i] == 0) continue; for (int j = i; j >= 0; j--) { cout << buf[j]; } break; } } int* add(int* buf, int k){ buf[0] += k; int t = 0; for (int i = 0; i < 50; i++) { int s = buf[i]+t; buf[i] = s % 10; t = s / 10; } return buf; } int* add(int* buf1, int* buf2){ for(int i = 60; i >= 0; i--){ buf1[i] += buf2[i]; } int t = 0; for (int i = 0; i < 50; i++) { int s = buf1[i]+t; buf1[i] = s % 10; t = s / 10; } return buf1; }